Clearing of rolls



Patented Apr. 22, 1941 OFFICE v ensamt: or noLLs Pierre Drewsen, Sandusky, Ohio, assignor to The llinde & Dauch Paper Company, Sandusky,

Ohio, a corporation of Ohio Application March 20, 1939, Serial No. 262,956 4 Claims. (Cl. 91-51) This invention is a continuation in part of my oo-pending application Serial No. 135.466, filed April 7, 1937, for Roll clearing (Pat. No. 2,155,083) and relates particularly -to further developments of and improvements in the apparatus and methods there disclosed.

My U. S. Pat. No. 2.089.949, of which Ser. No;

135,466 is a oontinuation in part, describes a process of coloring paper, particularly such as is to be used for the manufacture of corrugated and solid flber boxes, merchandise display stands, display material, and the like, where plain or design color effects may be desired.

In the operation of this process, and because of the varying widths of paper which it is necessary to use in the box business, it is necessary to remove coloring matter, or ink (or other material such as grease prooflng or waterproofing material in case the machine is used for this purpose, all conveniently referred to thereafter as ink), from certain zones of certain rollers in order that this transferred ink does not foul the edge of the paper. otherwise when the paper is rolled after treatment the edges in that roll will stick together. resulting in the waste of material and time in subsequent operations. The removal of such ink as described in U. S. Pat. No. 2,089,949 and No. 2,155,083 is accomplished by jets of air or other fluid properly directed against the rollers inthe zone of the edge of the sheet.

The use of such jetswhile entirely effective in accomplishing their purpose, is nevertheless attended by certain disadvantages. In the first place time is consumed in placing the Jet tips at the beginning of each run, and in adiusting them as the run proceeds, and whenever the paper changes direction, however slightly. At the beginning of each run, the trim or width of the sheet usually changes, necessitating at least an adiustment of the tip position. Shortly after the run starts it is almost always again necessary to change or slightly adjust the tips, and if this is not done promptly and properly the ink 4 is not well removed, resulting in a certain waste of paper because of sticking.

Another more serious disadvantage is the possibllity of personal iniury for the reason that the blower tips are of necesslty very close to the bite of rollers E and F, and in placing or ad- Justlng the tips, the operator's hands or clothing may become caught in the rolls. Another disadvantage is the ing insecurely fastened making it likely that they possibility of the blower tips bebecome caught, resulting in serious injury to both blower tips and rollers.

I have succeeded in over-coming these di'sadvantages. and in saving time in performing this operation, by eliminating the lets and their tips altogether, and by substituting therefor a doctor blade, as described in detail hereafter.

While this invention is of particular utility in the paper industry, and is herein disclosed in relation thereto, the method and the mechanism include features not limited to that industry. Hence I wish it understood that by description and explanation herein I'do not intend to exclude uses of my invention in other fields and in its broader aspects.

To the accomplishment of' the foregoing and related ends, the invention, then, oomprises the features hereinafter fully described, and particularly pointed out in the claims, the following description and the annexed drawing setting forth indetail certain illustrative embodiments of the invention, these being indicative however, of but a few of the various ways in which the principle of the invention may be employed.

In the accompanying drawing, which is in diagrammatic style,

Fig.'1 is an elevation of one type of apparatus to which my invention is applicahle;

Flg. 2 is an enlarged vertical section of the roll stand only of Fig. 1, transversely to the rolls;

Fig. 3 is a. perspective of the apparatus shown in Fia. 2; and

Fig. 4 is the same view as Flg. 2 but showing a further modiilcation.

The apparatus of Figfl 'illustrates speciiically though diagrammatically and with slight diil'erences in detail, the machine of my previous patents wherein the supply roll A furnislmesv the web of paper W through a pair of smoothing frlction bars B and over a guide roll C to a stand of rolls E, F, G, where one side is colored and printed, and from which the web goes around a dryer I, preferably a stationary steam heated drum contacting only the uncolored back of the paper, the amount of drying contact being roller J adjustable as indicated by the arc K. The printing roll stand here shown includes s, hard smooth roller E, a resilient roller F, and a printing roller G running in the fountain H and applying ink, and a pattern if desired, to the face of the web W.

Ink is carried up by roll G and applied to the web W against the squeeze of roll F. In Flg. 3

by stiplflins. as on the terthe ink is indicated mina! zones L of roll F. To remove ink from the regulated by the* end zones L and so keep itfrom creeping to the middle zone M, against which the back of the web bears, I apply a doctor blade P to the forward or up-travelling side of the roll F. This blade is preferably mounted on a pivot 'bar Q which is no matter what width of web W is being run. In

order not to score or otherwise injure the roller F the blade P has endwise reciprocation imparted to it by any suitable mechanism such as a crank, cam, lever or the like, diagrammatically indicated by the crank S, Fig. 3. A trough or troughs T catch the ink thrown back by the doctor blade P and from these it is led by downspouts U to the ink fountain H.

As an alternative arrangement, the doctor blade, designated in this instance as P' and shown as having a similar pivot bar Q', counterweights R', and reciprocating mechanism S', may be mounted on the rear of the top roll E. Here the action is that the ink transfers from the end zones L of roll F to the corresponding zones of roll E and if promptly removed and not allowed to build up will not travel into the zone M. This form of my invention is suitable where the material being applied is not too fluent. In this instance no gutter is necessary, for the reason that any ink thrown back will fall either on the inoperative ends of roller E or upon that face of the web W which is to be printed between rollers F and G.

From the foregoing it will be seen that I have devised a method which may be variously carried out, and forms of apparatus for practice ofthe method, which has immediate application to the fields of coloring and'printing on running webs, but not limited thereto, and whichresults in a superior product by reason of confining the ink or other agent to areas where it is wanted, and prevention of harm to the Operators or the machinery.

afasaass I ciaim: J

1. In a printing stand having a bottom roll dipping into an ink fountain, an intermediate roll pressing thereon and a top roll pressing on said intermediate roll, adapted to ink a web running between the bites of all said rolls, means for removing ink from the arc of said intermediate roll not covered by said web, said means comprising a doctor blade bearing upon said arc.

2. Ina printing stand having a bottom roll dipplng into an ink fountain, an intermediate roll pressing thereon and a top roll pressing on said intermediate roll, adapted to ink a web running around opposite arcs of said top and intermediate rolls and between the bites of said three rolls, means for removing ink from the portions of said intermediate roll not covered by said web, said means comprising a doctor blade bearing upon said portions, and glutters beneath but out of contact with said doctor blade and inward of the blade contact line for returning the ink removed therefrom to said fountain.

3. In a printing stand having a bottom roll dipping into an ink fountain,,an intermediate roll pressing thereon, and a top roll pressing on said intermediate roll, adapted to ink a web running around opposite arcs of said top and intermediate rolls and between the bite of said three rolls, means for removing ink from said top roll comprising a doctor blade adapted to return ink so removed to said intermediate roll and to that i face of the web which is to be inked.

4. In a printing stand having a bottom roll dipping into an ink fountain, an intermediate roll pressing thereon, -and a top roll pressing on said intermediate roll, adapted to ink a web running around opposite arcs of said top and intermediate rolls and between the bite of said three rolls, means for removing ink from said top roll comprising a doctor blade directed against the lower quadrant of the upward-moving side thereof and adapted to retum ink so removed to said intermediate roll and to that face of the web which is to be inked.

' PIERRE DREWSEN. 

